kube_pod_container_resource_[limits|requests] metrics missing in v2.0.0-alpha.2

[yli186]

What happened:
Since we have recently upgraded our cluster to 1.18 from 1.14, so we are trying out the v2.0.0-alpha.2 version. But we were not able to get any scrape for kube_pod_container_resource_limits, while kube_pod_container_resource_requests is scraping fine for most of the pod (for some stateful pods was also missing).

What you expected to happen:

kube_pod_container_resource_limits and kube_pod_container_resource_requests to scrape as per documented

How to reproduce it (as minimally and precisely as possible):
Run v2.0.0-alpha.2 image pulled from quay.io as a deployment on k8s 1.18 cluster.

Anything else we need to know?:

Environment:

• kube-state-metrics version: v2.0.0-alpha.2

• Kubernetes version (use kubectl version):
  Server Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.6", GitCommit:"dff82dc0de47299ab66c83c626e08b245ab19037", GitTreeState:"clean", BuildDate:"2020-07-15T16:51:04Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}

• Other info:
  Seems like regression from Revert "Rework resource metrics" #1278 per @jimmyseto mentioned in kube_pod_container_resource_[limits|requests] metrics not being exported #1245

[lilic]

Thanks for reporting! This is fixed in release-2.0 branch by @jimmyseto PR and will be included in the next pre-release sometime this week.